Pressure-exerting machine.



No. 689,960, Patented Dec. 3|, l90l. G. W. GREENWOOD.

PRESSURE EXEBTING MACHINE.

' filed J (Application 1y 12, 1901.)

2 Sheets-Sheet I.

I I o 0 W/ TNE SSE S vg rop By f. 7347?? 021% M ATTORNEYS No. 689,960. Patented Doc. 3|, l90l.

G. W. GREENWOOD.

PRESSURE EXERTING MAGHINE.

(Application filed July 12, 1901.)

2 Sheets-Sheet 2.

(No Model.)

IIIIIIJ III z m VENTOR A TTORNEYJ' WITNESSES ITED STATES PATENT OFFICE.

GEORGE W. GREENWOOD, OF CLEVELAND, OI-IIO.

PRESSURE-EXERTING MACHINE.

SIEUIFICATION forming part- Of Letters Patent NO. 689,960, dated December 31, 1901.

Application filed July 12, 1901. Serial No. 67,968. (No model.)

To all whom it may concern:

Be it known that I, GEORGE W. GREEN- WOOD, a resident of Cleveland, in the county of Guyahoga and State of Ohio, have invented certain new and useful Improvements in Pressure-Exerting Machines; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvement-s in pressure-exerting machines suitable for use in gripping, pressing, and forging operationsas, for instance, in gripping or exerting pressure against a blank or stock which is to be converted or formed into a predetermined article of manufacture; and the invention pertains more especially to a machine of the character indicated, which comprises a suitably-guided pressure-exerting block capable of reciprocation and actuated by a suitably-operated toggle-joint.

The primary object of this invention is to provide improved means for avoiding breakage of or injury to any portion of the mechanism of the machine by an excess of material to be operated upon by the pressure-everting block or by any obstructing matter obtaining ingress to the space entered by the blank, stock, or material which is to be pressed against or otherwise operated upon by the pressure-exerting block.

Another object of the invention is to distribute the strain upon the pressure-exerting block over a large portion of the stationary framework or bed of the machine and to effectually prevent twisting or waobling or displacement of the said block and to vastly enlarge the wearing-surfaces of the block.

With these objects in view and to the end of realizing other advantages hereinafter appearing the invention consists in certain features of construction and combinations of parts hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure I is a top plan of a pressure-exerting machine embodying my invention. Fig. II is a vertical section on line II II, Fig. I, looking in the direction indicated by the arrow. Fig. III is a horizontal section in detail on line III III, Fig. II, looking in the direction indicated by the arrow. Fig. IV is a vertical section on line IV IV, Fig. I, looking inwardly. Fig.V is a vertical section on line V V, Fig. I, looking outwardly.

Referring to the drawings, adesignates the stationary horizontally-arranged bed of the machine, and b a crank-shaft, which is arranged horizontally at one end of and supported from the bed a. The shaft b is provided at one end with a driving-pulley c. A

pressure-exerting block it (see Figs. I and IV) is arranged at and supported from the opposite end of the bed a. The block h is ca,- pable of reciprocation and has its line of travel arranged parallel with the shaft 1). The shaft 19 and the block it are arranged, therefore, parallel and a suitable distance apart longitudinally of the bed a. The block h is arranged to operate between two guide-tome ing walls 5 and 6, provided upon the bed a and arranged at the inner side and outer side,-

respectively, of the path of the said block. The walls 5 and 6 are formed, preferably, by bars rigidly secured to the body portion of the bed a in any approved manner.

The block h is operated by a toggle-joint arranged at one end of the said block h between the said block it and a thrust-block n. The said toggle-joint has its knuckle m provided with a shank or arm 7, which extends toward the slide Z and is pivoted vertically, as at S, to the said slide. The slideZ is capable of reciprocation and arranged to operate between the shaft b and the travel of the block 77.. The toggle-joint is therefore operatively connected at its knuckle m with the slide Z, which is operatively connected by a pitman 9 with the crank 9 of the shaft 1), and the bed a is provided with walls 10, arranged to form guides for the said slide. The two links 7' and t of the toggle-joint connect the toggle-knuckle m with the blocks a and h, respectively. The toggle-joint is applied in the usual manner, having opposite ends of its link if pivoted vertically, as at f, to the toggle-knuckle and to the block h, respectively, and having opposite ends of its other link 1 pivoted vertically, as at g, to the toggleknuckle m and to the thrust-block a, respectively.

The block 72 is provided at the bottom and at its toggle-joint-conuect-ing end with a flat horizontally arranged extension is, which (see Figs. I, II, IV, and V) normally projects and extends in under the toggle-joint and has its outer end slotted vertically and centrally, as at 70, to form two arms 70 and 7& normally extending along the outer side and inner side, respectively, of the thrust-block n, which is arranged, therefore, between the paths of the arms 70 and 70 and is integral or rigid with the bed a. The block extension is is provided at its outer side edge with an upwardly-projecting flange 18, extending from the block proper to the outer or free end of the outer arm 10 of the said extension is. The flange 18 has bearing at its outer side against the inner surface of the adjacent portion of the bar 6, which extends along the said flange to the outer or free end of the aforesaid arm k The bar 6 forms a side bearing, therefore, for the block extension is and its flange 18 along the entire length of the said member 7c. The flange 18 extends upwardly flush with the upper edge of the bar 6 along the entire length of the said flange. The block extension is is provided at its inner side edge with an upwardly-projecting. flange 19, extending 'along the inner arm 70 of the said extension 7% The flange 19 has bearing at its outer side against the inner surface of a guide-bar 15, which ex-.

tends along the said flange to the outer or free end of the aforesaid arm 74 The bar 15 forms a side bearing, therefore, for the block extension It and its flange 19. The bar 15 and the flange 19 extend upwardly as far as the bar 6 and the flange 18.

It will be observed that the member 76 and its flanges 18 and 19 materially extend or enlarge the wearing-surfaces of'the block 72, and the improved construction hereinbefore described not only effectually prevents twisting or wabbling of the block it, but accommodates the formation of the thrust-block nintegral with the bed ct. The arrangement of the thrust-block 'n between arms 74 and 71:

formed upon the block extension is, accommodates an unlimited upward extension of the flanges 18 and 19, and consequently enables the provision of a vast enlargement of the said flanges andthe side bearings formed by the bars 6 and 15.

The slide Z comprises an outer block 25 and an inner block 30. The block 25 rests upon the bottom of the recess or slideway formed between the walls 10. The block 30 is preferably generally cylindrical in end elevation or cross-section, as shown in Figs. III and IV, and arranged within and movable endwise of a correspondingly-shaped chamber 26, which is formed in and extends longitudinally and is open at the outer end of the block 25. The

arm 7 of the toggle-knuckle m is attached directlyto the outer end of the block 30--that is, the pivot 8, which operatively connects the arm 7 of the toggle-knuckle with the slide Z,

(blocks 25 and 30,) extends through the said arm into the block 30 and not into the block 25; but the pitman e, instrumental, as alreadyindicated,in establishing operative con nection between the slide Z and the shaft 12, is attached directly to the block 25 and not to the block 30. During-the operation of the pitman e the block 30 moves with the block 25, so as to result in the actuation of the toggle-joint; but the block 30 is yieldingly held in position within the block 25, as will hereinafter clearly appear- The block it should adequately engage and operate upon the stock, blank, or material (not shown) to be engaged or pressed against,

and the arrangement of the parts is such,

therefore, that the block it shall have commenced to operate before theouter block 25 of the slide 1 has completed its stroke in the direction of the path of the said block h and that the block 30, with which the toggle-joint is directly connected, as already indicated, shall be capable of yielding, if necessary, dur= ing the said stroke after the said block h has commenced to engage the work, as aforesaid, so that the liability of any excess of material or obstructing matter against which the block it is actuated, resulting in breakage of or injury to the toggle-joint and connected parts, is reduced to a minimum. It will be observed, therefore, that the block 30 is movable endwise and independently of the block 25, and the yieldable means acting to retain the block 30 in its normal position within the block 25 comprises, preferably, a vertically movable or yieldable block j, mounted upon the block 30. The block j is preferably cylindrical and arranged within the correspondingly-shaped chamber of a cylindrical case 27, which is formed upon the top of the block 25. The

case 27 has its outer end internally screwthreaded and engaged by a correspondingly externally threaded plug 19, and one or more spiral springs s are confined within the cham* ber of the case 27 between the opposing surfaces of the plugp and the block A short bar to extends from within the blockj downwardly and in the direction of the outer end 30 is suitably chambered, as at 31, to provide a bearing for the journal 36, and the chamber 31 extends to and is open adjacent the block j and has the dimensions required to accommodate the location andoperation of the bar u. The spring or springs s are normally compressed or under tension and throughthe medium of the blockj and the bar it retain the block 30in itsouter and normal position within the block 25. The springs s are sufficiently powerful to retain the block 30 in its normal position until an abnormal excess occurs in the work provided for the pressure-exerting block or plunger h.

To prevent the block 30 from being pushed or actuated outwardly beyond its normal position, a stop is provided and comprises, preferably, a pin w, which extends horizontally and transversely through the block 30 at right angles to the line of travel of the slide 1 into engagement with slots 28, formed in and extending longitudinally of the side walls of the chamber 26 of the block 25. In the normal position of the parts the pin w engages the forward end walls of the slots 28, as shown in Figs. II and III. The pin to and the forward end walls of the slots 28 form astop for limiting the outward movement of the block 30 by the action of the spring or springs within the case 24. The pin extends through a chamber 38, formed within the block 30, which has the bearing for the said pin extending between the side walls of the said chamber 38, as at 29, and a suitably-applied set-screw 39 extends into engagement with the pin 10 through a correspondingly-threaded lateral hole with which the said bearing is provided and prevents endwise displacement of the said pin.

I would remark that the cylindrical form of the block 30 and the correspondinglyshaped chamber of the block are valuable also because thereby a rounded and extensive bearing for the block is formed. The action of the springs 8 results in considerable friction between the block 30 and the bearing forming internal wall or walls of the block 25 and obviously a larger area of surface of the block 30 in contact with a corresponding area of surface of the block results in the distribution of the friction over a correspondingly large area, and consequently the aforesaid construction is durable as well as simple and convenient.

What I claim is g 1. In a machine of the character indicated, apressure-exerting block h capable of reciprocation; a slide Z comprising an outer block 25 and an inner block 30 arranged within and adapted to be moved endwise and independently of the block 25; means adapted to reciprocate and attached directly to the outer block 25; mechanism adapted to actuate the pressure-exertin g block and attached directly to the inner block 30; a short baru extending from outside of the block 30 in the direction of the outer end of and into the said block 30; yieldable means acting to cause the said bar it to push the block 30 outwardly, and means for preventing the block 30 from being actuated outwardly beyond its normal position.

2. In a machine of the character indicated, apressure-exerting block h capable of reciprocation; a slide Z comprising an outer chambered block 25 having two slots 28 and 28 formed in and arranged longitudinally of opposite side walls, respectively, of the chamber of the said block, and an inner block 30 arranged within and adapted to be moved endwise and independently of the block 25; means adapted to reciprocate and attached directly to the outer block 25; mechanism adapted to actuate the pressure exerting block and attached directly to the inner block 30; a short bar to extending from outside of the block 30 in the direction of the outer end of and into the said block 30; yieldable means acting to cause the said bar it to push the block 30 outwardly, and a pin to extending transversely of and through the block 30 into engagement with the aforesaid slots 28, substantially as and for the purpose set forth.

3. In a machine of the character indicated, a pressure-exerting block h capable of reciprocation a slide 1 comprising an outer block 25 and an inner block 30 arranged within and adapted to be moved endwise and independently of the block 25; means adapted to re ciprocat-e and attached directly to the outer block 25; mechanism adapted to actuate the pressure-exertin g block and attached directly to the inner block 30; a blockj arranged adjacent to and movable from and toward the block 30; yieldable means acting to retain the said block j in its inner and normal position a short bar to extending from Within the block j in the direction of the outer end of and into the block 30, which bar 'L6 is provided with two journals and 36 formed upon the outer end and inner end, respectively, of the said bar and arranged transversely of the path of the slide Z and having bearing in the blocks j and 30, respectively, and means for preventing the block 30 from being pushed or actuated outwardly beyond its outer and normal position.

4. In a machine of the character indicated, a pressure-exerting block h capable of reciprocation; a slidel comprising an outer block 25 and an inner block 30 arranged within and adapted to be moved endwise and independently of the block 25; mechanism adapted to actuate the pressure-exerting block and attached directly to the inner block 30; a block j arranged adjacent to and movable from and to ward the block 30 a correspon dingly-shaped case 27 surrounding the said blockj and rigid with the block 25; a spiral spring sconfined Within the chamber of the case and acting against the outer end of the blockj; a short bar it extending from within the block j in the direction of the outer end of and into the block 30, which bar it is provided with two journals 35 and 36 formed upon the outer end and inner end, respectively, of the said bar and arranged transversely of the path of the slide Z and having bearing in the blocksj and 30, respectively, and means for preventing the block 30 from being actuated outwardly beyond its outer and normal position.

5. In a machine of the character indicated, a pressure-exerting block it capable of reciprocation; a slide Z comprising an outer block 25 and an inner block 30 arranged within and adapted to be moved endwise and independently of the block means adapted to reciprocate and attached directly to the outer block 25; mechanism adapted to actuate the pressure-exerting block and attached directly to the inner block 30; a vertically-movable block j mounted upon and movable from and toward the block 30; acorrespondingly-shaped case 27 surrounding the said blockj and rigid with the block 25; a spiral spring 5 confined within the chamber of the case and acting against the outer end of the block j; a short bar uextending from within the block j in the, direction of the outer end of and intothe block 30, which bar a is provided with two journals 35and 36 formed upon the ou -terend and. inner end, respectively, oi the said bar and arranged at right anglesto the pat-hot the slid-cl and havingbearing in the blocks 3' and, 80, respectively,and means for preventing, the block 30 from being, actuated outwardl-ybeyondi-its outer and normal position.

6, In, a machine ofthe character indicated, a pressure-exerting block it capable of reciprocation; a. slide Zcomprising anouterblock 25 and aninner block 30 arranged'within-and adapted to be moved endwiseand independently, of the block 25'; means adapted to reciprocate and, attached; directlyv to the outer block 25; mechanism adapted, to actuate the pressure=exerting block h and attached directlyto the inner block 30; a vertically-movable cylindrical block j, mounted upon the block 30; a correspondingly-shaped case 27 surrounding the said block 3', and rigid with the ,block 25, which case 27 has its upper end internally screw-threaded; a correspondingly externally threaded plug 1) screwed; intothe upper end of the said case; spiral springs s confined within the chamberofthe case 27 between theopposing surfaces-of the plug p andthe block j;- a short bar u extending from Within the block j in the direction of the outer end of and into the block 30, whichbarit is provided with two journals135 and 36 formed upon theouter end and inner end, respectively, of the saidbar and arranged at right anglesjtot-hepath of the slidel and having bearing in the'blocks j and 30, respectively, andmeansfor, preventing, theblock 30 from being actuated outwardly beyond its outer an'd inormal position.

7; Inamachine of thecharacter indicated, apressure-exerting block h capable of reciprocation a slide Zcomprisingan outer block 25 having acylindricalchamber-26, andgacorrespondingly cylindrical inner block 30 fittinglw-ithin andradapted to be moved endwise and'independently of the said outer block 25; means adapted to reciprocate and attached directly to theouter block 25; mechanism,

adapted to actuate the pressure exerting block and attached directly to theinnerblock 30; a memberv u extending from outside of theinner block 30 in the direction of the outer end of and into the said block 30; and yieldablemeansarranged-to act upon the said memher it to retain the inner block 30 in its outer and normal position.

8. A machine of the character indicated, comprising a bed a; a thrust-block n rigid with the said bed; a pressure-exerting block h arranged a suitable. distance from and movable from and toward the thrust-block, which pressure-exerting block is provided with an extension is having two arms and 70 which are arranged at opposite sides, respec-ttvely,

' of the thrust-block,vs-rhich extension-has two upright flanges 18 and 19extendi-ng alongtho armsk and 70 respectively.; side bearings-for the outer sides of the said flanges; a togglejoint arranged between the aforesaid blocks and having one of its links operatively connected with the pressure-exerting bloclqand having its other link attached to the thrustblock, and means for operating the, toggle joint.

J.-A machine of the character indicated,

comprising a bed a; a thrust-block n rigid,

with the bed a pressure-exerting block har ranged a suitable distance from and movable 7 from and toward the thrust-block, which pressure-exerting block isprovided with; anextension 76 having two arms 76 and It? which'are arranged at opposite sides, respectively, of the thrust-block, which extension hastwo upright flanges, 18 and 19 extending along the arms-7r and k respectively, and the flange .18 extending from the outer end of thelarm 70 to the block h; side bearings for theouter .sidesot the said flanges; a toggle-joint arrangedbetween the aforesaid blocks and hav ing oneof its linksoperativelyconnected with the pressure-exerting block, and having its other link attached to the-thr-usablock, and

. means for operating the toggle joint,

10. A- machineofi the characterv indicated,

comprising a bed a; a. thrust-block n rigid with the bed a pressure-exertin g; block hartom of thepressure-exerting' block and. ex-

tending in under thetoggle-j oint and having two arms k and it? which arearranged atopposite sides, respectively, of thet-hrust-block;

two upwardly-projecting flanges 18- and 19 formed uponvthe block extension 70 and extending alongthe arms is and 70 respectively, :and side bearingsv for the outersidesofthe said flanges.

11. A machine of the character indicated, comprising a bed a; a thrust-block n rigid withthe bed; apressure-exerting block it arranged asuitable distance from and movable -;from and towardthe thrust-block; a togglejoint arranged between the aforesaid blocks andhaving one of its links operatively conigc nected with the pressure-exerting block, and having its other link attached to the thrustblock; means for operating the toggle-joint; an extension it formed upon and at the bottom of the pressure-exerting block and extending in under the toggle-joint and having two arms 7: and k Which are arranged at opposite sides, respectively, of the thrust-block;

two upwardly-projecting flanges 1S and 19 

